American glamour model and actress Denise Richards has admitted to going under the knife three times in order to perfect her famous boobs.

The 38-year-old former Bond girl told US radio personality Howard Stern that she had two breast augmentations and one reduction.

"I was 19, and my roommate had the best boobs ever, and she had just had hers done. I was flat as a board, and I thought, ‘Whoa, you can just buy them,’ and stupidly had them done," she said.

"The next guy put bigger ones in, and it was not good – they were a D cup! They looked ridiculous on my frame. After I did the Bond film, I had them changed out and made smaller."

Denise is best known for her roles in The World Is Not Enough, Wild Things and Scary Movie 3.

She has two daughters with ex-husband Charlie Sheen. The couple divorced in 2006 after four years of marriage.